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然而，miR159是否整合到脫落酸（ABA）信號(hào)通路中以控制營養(yǎng)相的變化仍然是未知的，因?yàn)閙iR159在ABA反應(yīng)中也起著重要的調(diào)節(jié)作用。

在這里，我們顯示ABI5（ABA不敏感5）的表達(dá)，ABA信號(hào)通路中的一個(gè)關(guān)鍵調(diào)節(jié)因子，在功能喪失突變體miR159（mir159ab）中顯著升高。

ABI5的功能喪失（ABI5）促進(jìn)了幼年到成年的轉(zhuǎn)變，而ABI5的過度表達(dá)在短日照條件下延遲了這種轉(zhuǎn)變。

遺傳分析表明，mir159ab對(duì)營養(yǎng)相變的影響是ABI5依賴性的。進(jìn)一步的分析證實(shí)MYB33是miR159的一個(gè)主要靶點(diǎn)，它通過直接結(jié)合ABI5的啟動(dòng)子來促進(jìn)ABI5的轉(zhuǎn)錄。ABI5在miR156上游發(fā)揮作用，通過影響miR156-SPL途徑中的基因表達(dá)來促進(jìn)幼年發(fā)育。

因此，我們的研究揭示了ABI5在植物營養(yǎng)發(fā)育中的新作用，并暗示了ABA信號(hào)在擬南芥營養(yǎng)發(fā)育中的作用。

• Vegetative development constitutes a critical phase in plant development, and it is regulated by an evolutionarily conserved miR156-SPL pathway. Previous studies have shown that miR159 acts to prevent the hyperactivation of miR156 to regulate the timing of vegetative phase change in Arabidopsis.

• However, whether miR159 integrates into the abscisic acid (ABA) signaling pathway to control vegetative phase change remains unexplored, since miR159 also plays an important regulatory role in ABA response.

• Here, we show that the expression of ABI5 (ABA INSENSITIVE5), a crucial regulator in the ABA signaling pathway, is significantly elevated in the loss-of-function mutant of miR159 (mir159ab). Loss of function in ABI5 (abi5) promotes juvenile-to-adult transition, whereas overexpression of ABI5 delays this transition under short-day conditions. Genetic analyses indicated that the effect of mir159ab on vegetative phase change is ABI5 dependent. Further analysis confirmed that MYB33, a major target of miR159, promotes the transcription of ABI5 by directly binding to its promoter. ABI5 functions upstream of miR156 to promote juvenile development by affecting the expression of genes in the miR156-SPL pathway.

• Therefore, our study uncovers a new role of ABI5 in vegetative development in plants, and implies a role of ABA signaling in vegetative development in Arabidopsis.

• https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.17371?af=R
  

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